Chemistry - Thermodynamics

Question - 1

N2+3H2 \(\longrightarrow\) 2NH3+22kcal

Select the correct alternate about this reaction.

  • A it is an endothermic reaction
  • B it is an exothermic reaction
  • C system gets heated
  • D None of the above

Question - 2

2SO2+O2 \(\longrightarrow\) 2SO3

In this reaction some of the following facts are observed 

I:Surrounding get heated

II:Increase in temperature favours dissociation of SO3 hence,

  • A This is an endothermic reaction
  • B This is an exothermic reaction
  • C Pressure has no effect on this reaction
  • D Concentration has no effect on this reaction

Question - 3

Dissolution of NH4Cl in H2O is

  • A an exothermic reaction
  • B an endothermic reaction
  • C a reaction with \(\Delta H=0\)
  • D a reaction with \(\Delta S=0\)

Question - 4

A+B+x1 \(\longrightarrow\) C+D+X2 

Select the correct statement

  • A If x1 > x2 the reaction is exothermic 
  • B If x2> x1 thereaction is endothermic
  • C If x2 > x1 exothermic
  • D If x2=x1 the reaction is endothermic

Question - 5

N2 + O2 \(\longrightarrow\) 2NO,\(\Delta H\) =43.2kcal

Based on the reaction shown which statement is true?

  • A 43.2 kcal are consumed when 1.00g of N2 reacts
  • B 43.2 kcal are consumed when 1.00g of O2 reacts
  • C 43.2 kcal are consumed when 1.00mol of O2 reacts
  • D 43.2 kcal are released when 2.00molof NO are formed

Question - 6

If liquid is converted into solid state then

  • A heat is observed
  • B heat is evolved
  • C no enthalpy change
  • D heat change depends on nature of solvent

Question - 7

For the following reaction, N2+3H2\(\rightleftharpoons \) 2NH3

increase in temperature favours dissociation of NH3,hence this reaction is

  • A exothermic in forward direction and endothermic in backward direction
  • B endothermic in forward direction and exothermic in backward direction
  • C exothermic in forward direction
  • D endothermic in forward direction

Question - 8

Consider the following changes
I: adsorption
II: fusion
III: freezing
Iv: vaporisation
Exothermic changes are

  • A I,II
  • B I,III
  • C I,IV
  • D II,IV

Question - 9

Consider the following changes
I: adsorption
II: fusion
III: freezing
Iv: vaporisation
Endothermic changes in above are

  • A II,III
  • B III,IV
  • C I,II
  • D II,IV

Question - 10

Consider the following reactions
I:C(graphite)+O2(g) \(\longrightarrow\) CO2(g); \(\Delta H^0=-x_1 cal\)
II:CO(g)+\(1\over2\)O2(g) \(\longrightarrow\) CO2(g); \(\Delta H^0=-x_2 cal\)
Based on the above data,\(\Delta H^0_f(CO_2)\)is 

  • A -x1 cal
  • B -x2 cal
  • C (x2-x1)cal
  • D (x1-x2)cal
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